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• ~b <br />COLORADO DISCHARGE PERMIT SYSTEM (CDPS) <br />AMENDMENT NO. l -RATIONALE <br />CYPRUS EhIPIRE CORPORATION <br />EAGLE h11NE COMPLEX <br />CDPS PERM1IIT NUMBER CO-0034142, MOFFAT COUNTY <br />1. TYPE OF PERMIT <br />R. FACILITY INFORMAT/ON <br />A. Facility Type: <br />Fee Categories: <br />and <br />Total Annual Fee: <br />8. Legal Concoct: <br />C. Facility Contact: <br />D. Facility Localion: <br />/11. PURPOSE OF ArtfENDMENT <br />Amendment <br />Industrial <br />Category 02, Subcntegorv 2 (Coal Mining (Mine water, prep plntrtJ ($612J <br />Category 24, Subcategory 2 (Irutividual Industrial Storntwater -greeter than <br />10 acres) ($300J <br />$912 <br />Michael W. Ludlow <br />General Manager <br />Cyprus Empire Corporntian <br />P. O. Bax 68 <br />Craig, CO 81626 <br />(303J + 824-8246 <br />Mmrus A. Middleton <br />Environmerunl Engnteer <br />Cvprus Empire Corporntian <br />P. O. Bor &4 <br />Craig, CO 81626 <br />(303J +824-8246 <br />Cyprus Empire Corporntion'.c, (hereafter rejer'ed w as CECJ, Engle Mine <br />Complex is lornted in Sectiotrs 30, 31, and 32, Township 6 North, Range 9/ <br />West and Serrion 6, ToN~nship 5 Norh, Range 91 Wesr. <br />/n n lever doted October 5, 1994, the perrninee has requested that the upper pH limitntimr for ourjn(l 023 be raised from <br />9.0 s. u. to 9.4 s. u. The system experiences erees.rive algal activity in the wormer months musing the pH to elevate <br />rhu~img this period. !t is likely char chemical canto! of the algae would iuterjere with the biological nctim+ in the lagoons <br />and cony nrlversely affect other ejJlueut parnniererr, ns well a.r adding pollutants. Therefore, the lesser impact to dre <br />recen~ing water would be the elevated pH level. <br />I7ve Divisiar performed nn extensive evnbrarion in 1983 to deternrine if nn increased pH at this ourfall would impact the <br />receiving water. No notable impact was expected through n pH oj9.7,' drerejore, dte Division approved the change nud <br />amended the lindtntion for outfnll 023 in 1984. When dre permit was lost renewed in 1994, the need jot this change was <br />no longer apparent breed on dre review ojself monitoring darn performed nt that time oral the upper limimrion was <br />returned to 9.0 s. u. However, the justification for allowing the higher limitation remairu valid. the permiuee again <br />finds the creed for the higher pH limitation. On this basis, the permit will be nmeruted. Li order to ovoid potential <br />exceedences irr the future, the limitation will be increased to 9. 7 s. u. Part 1. A. 1. (cJ on page iv of the permit will be <br />amended. This nctiou is subject to public nonce requirements. <br />loo C. Kubrc <br />January 12, 1995 <br />